Cheers fellas!
I'm going down there tomorrow evening to play chicken with the traffic and get some photo's.
It may just have been a cat's eye which I guess means I haven't really got a case.
Further to my original post, it looks like it hasn't broken the bead on the tyre (it's still bang on the right pressure after cooling down and being dented about 15 hours ago). A mate of mine reckons it could be repaired. There are no cracks etc. just a dent.
If anyone knows any decent wheels fixers in the Wilts/Hants/Glos/Oxon areas please post up their details.
Cheers.
Jacko.